Electric wire with terminal

Abstract

To provide an electric wire with a terminal capable of reducing an increase in electric resistance between a conductor and the terminal even under a high temperature environment.SOLUTION: A terminal-equipped electrical wire includes an electrical wire in which a bundle of a plurality of conductors is covered by an insulator layer, an intervening tape wound around an outer circumferential surface of a conductor exposed portion in which the bundle of the plurality of conductors is exposed from the insulator layer, and a terminal attached by crimping to the conductor exposed portion via the intervening tape. Each of the plurality of conductors includes aluminum. The terminal includes a main body made of copper or copper alloy and a tin plating layer formed on a surface of the main body. The interposition tape includes a body layer made of copper or a copper alloy, and a tin plating layer formed on a surface of the body layer.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present disclosure relates to a terminal-equipped electric wire. [Background technology]

[0002] Patent Documents 1 and 2 disclose electric wires with terminals. The electric wires with terminals are manufactured by crimping a terminal onto the end of an electric wire. The conductors of the electric wires are described as being made of aluminum or an aluminum alloy. The terminals are described as being made of copper or a copper alloy. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-29127 [Patent Document 2] Japanese Patent Application Laid-Open No. 2017-21894 Summary of the Invention [Problem to be solved by the invention]

[0004] Tin-plated copper terminals are known as terminals. Tin-plated copper terminals have a main body made of copper or a copper alloy and a tin-plated layer formed on the surface of the main body. When an electric wire has an aluminum conductor and the terminal is a tin-plated copper terminal, the conductor is prone to oxidation in high-temperature environments, which can result in an increase in electrical resistance between the conductor and the terminal.

[0005] In one aspect of the present disclosure, it is preferable to provide an electric wire with a terminal that can reduce an increase in electrical resistance between a conductor and a terminal even in a high-temperature environment. [Means for solving the problem]

[0006] One aspect of the present disclosure includes an electric wire in which a bundle of conductors is covered with an insulating layer, an interposing tape wound around an outer peripheral surface of an exposed conductor portion where the bundle of conductors is exposed from the insulating layer, and a terminal crimped and attached to the exposed conductor portion via the interposing tape. Each of the conductors includes aluminum. The terminal includes a main body portion made of copper or a copper alloy and a tin-plated layer formed on the surface of the main body portion. The interposing tape includes a main body layer made of copper or a copper alloy and a tin-plated layer formed on the surface of the main body layer.

[0007] The terminal-attached electric wire according to one aspect of the present disclosure can reduce an increase in electrical resistance between the conductor and the terminal even in a high-temperature environment. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a plan view illustrating the configuration of a terminal-attached electric wire. [Figure 2] FIG. 2 is a side view illustrating the configuration of a terminal-attached electric wire. [Figure 3] FIG. 2 is a cross-sectional view taken along the line III-III in FIG. [Figure 4] 4 is a cross-sectional view taken along the line IV-IV in FIG. 1 before the electric wire connection portion is crimped. [Figure 5] 4 is a cross-sectional view taken along the line IV-IV in FIG. 1 after the electric wire connection portion has been crimped. [Figure 6] 1 is a cross-sectional view showing the layer structure of an interposing tape having a main body layer made of copper and tin-plated layers formed on both sides of the main body layer. [Figure 7] 3 is a schematic diagram showing the shape of the conductor and the conductor side surface of the interposing tape. FIG. [Figure 8] 1 is a graph showing the resistance increase rate in the terminal-attached electric wires of Examples and Comparative Examples. [Figure 9] 9A to 9F are electron microscope photographs showing cross sections of the observed portions of the terminal-attached electric wires of Examples 1 to 6, respectively. DETAILED DESCRIPTION OF THE INVENTION

[0009] Exemplary embodiments of the present disclosure will now be described with reference to the drawings. First Embodiment 1. Configuration of terminal-attached wire 1 The configuration of the terminal-fitted electric wire 1 will be described with reference to Fig. 1 to Fig. 7. As shown in Fig. 1 and Fig. 2, the terminal-fitted electric wire 1 includes an electric wire 3 and terminals 5. Although the terminals 5 are attached to both ends 3A of the electric wire 3 in Fig. 1 and Fig. 2, the terminals 5 may be attached to only one end 3A of the electric wire 3.

[0010] Fig. 3 is a cross-section of the electric wire 3, taken along the line III-III in Fig. 1. The cross-section shown in Fig. 3 is perpendicular to the longitudinal direction L of the electric wire 3 and a bunched stranded conductor 7 (described later) and does not pass through the end portion 3A. As shown in Fig. 3, the electric wire 3 includes bunched stranded conductors 7 and an insulating layer 9. In the cross-section perpendicular to the longitudinal direction L, the bunched stranded conductors 7 have, for example, a circular shape. The diameter of the bunched stranded conductors 7 is preferably 3.1 mm or more and 26 mm or less. However, the portion of the bunched stranded conductors 7 that is crimped together with a wire connection portion 31 (described later) is deformed.

[0011] The bunched stranded conductor 7 is made up of a bundle of multiple conductors 21. The multiple conductors 21 are twisted together. The direction in which the multiple conductors 21 are twisted together may be clockwise or counterclockwise. Each of the multiple conductors 21 is a linear member extending along the longitudinal direction L. In a cross section perpendicular to the longitudinal direction L, each conductor 21 has a circular shape, for example. The diameter of the conductor 21 is preferably 0.26 mm or more and 3.7 mm or less.

[0012] The conductor 21 may be a single wire or may be made by twisting together multiple wires. The wire may be, for example, an aluminum wire. For example, a plating layer may be formed on the surface of the wire. In this case, corrosion of the wire can be suppressed. The direction in which the multiple wires are twisted together may be clockwise or counterclockwise. The direction in which the multiple wires are twisted together may be the same as or different from the direction in which the multiple conductors 21 are twisted together.

[0013] Each of the plurality of conductors 21 includes aluminum. For example, each of the plurality of conductors 21 is made of aluminum or an aluminum alloy. For example, the conductors 21 have a plating layer on the surface. For example, the plating layer has a function of suppressing corrosion. For example, the plating layer is a tin plating layer.

[0014] For example, as shown in Fig. 3, the bunched stranded conductor 7 includes two or more layers each including a plurality of conductors 21 arranged in the circumferential direction. Note that the circumferential direction is the circumferential direction based on the center of the electric wire 3 in a cross section perpendicular to the longitudinal direction L.

[0015] For example, the bunched stranded conductor 7 may include a conductor 21A located at the center of the bunched stranded conductor 7, a layer formed by conductors 21B arranged in the circumferential direction, a layer formed by conductors 21C arranged in the circumferential direction, and a layer formed by conductors 21D arranged in the circumferential direction. Note that the conductors 21A, 21B, 21C, and 21D are one form of the conductor 21.

[0016] The layer in which the conductors 21B are arranged in the circumferential direction is provided on the outer circumferential side of the conductors 21A. The outer circumferential side refers to the outer circumferential side based on the center of the electric wire 3 in a cross section perpendicular to the longitudinal direction L. The number of conductors 21B arranged in the circumferential direction is, for example, six.

[0017] The layer in which conductors 21C are arranged in the circumferential direction is provided on the outer periphery of the layer in which conductors 21B are arranged in the circumferential direction. The number of conductors 21C arranged in the circumferential direction is, for example, 12. The layer in which conductors 21D are arranged in the circumferential direction is provided on the outer periphery of the layer in which conductors 21C are arranged in the circumferential direction. The number of conductors 21D arranged in the circumferential direction is, for example, 18.

[0018] As shown in Fig. 3, an insulating layer 9 covers the bunched stranded conductors 7. However, as shown in Figs. 1 and 2, at end 3A, the bunched stranded conductors 7 are not covered with the insulating layer 9 and are exposed from the insulating layer 9. End 3A is an end of the bunched stranded conductors 7. End 3A corresponds to the exposed conductor portion. Examples of materials for the insulating layer 9 include resin and rubber. The electric wire 3 may further include a shielding layer or the like.

[0019] As shown in FIGS. 1 and 2, the terminal 5 is electrically connected to the electric wire 3 at the end 3A. The terminal 5 includes a wire connection portion 31 and a mating connection portion 33. The terminal 5 is, for example, a round crimp terminal. When the terminal 5 is a round crimp terminal, the wire connection portion 31 is a hollow cylindrical portion. The mating connection portion 33 is, for example, a flat plate-like portion. In accordance with JIS C2805:2010 (Crimp terminals for copper wires), a terminal 5 having an inner diameter of the wire connection portion 31 suitable for the cross-sectional area of ​​the bunched stranded conductor 7 can be selected.

[0020] The end 3A is inserted into the electric wire connection portion 31. With the end 3A inserted into the electric wire connection portion 31, the electric wire connection portion 31 is crimped. As a result, the terminal 5 is fixed to the electric wire 3. A commercially available crimping jig or compression jig can be used for crimping.

[0021] 4 and 5 are cross sections perpendicular to the longitudinal direction L and passing through the end portion 3A and the electric wire connection portion 31, and represent the IV-IV cross section in FIG. 1. Fig. 4 represents the cross section before the electric wire connection portion 31 is crimped. Fig. 5 represents the cross section after the electric wire connection portion 31 is crimped. After the electric wire connection portion 31 is crimped, the electric wire connection portion 31 and the bunched stranded conductor 7 are deformed as shown in Fig. 5.

[0022] The terminal 5 is a tin-plated copper terminal. As shown in FIG. 4, the terminal 5 includes a main body 5A made of copper or a copper alloy and a tin-plated layer 5B. The tin-plated layer 5B is formed on the surface of the main body 5A. The tin-plated layer 5B is also formed on the inner surface of the electric wire connection portion 31. The tin-plated layer 5B is also formed on the outer peripheral surface of the electric wire connection portion 31. The thickness of each of the tin-plated layers 5B is, for example, not less than 0.1 μm and not more than 10 μm. The tin-plated layer 5B has, for example, a function of suppressing corrosion.

[0023] As shown in Fig. 4, the terminal-attached electric wire 1 further includes an intervening tape 41. The intervening tape 41 is wound around the outer circumferential surface of the bunched stranded conductor 7 in an area that includes at least a portion of the end 3A. The intervening tape 41 is present between the tin-plated layer 5B of the electric wire connection portion 31 and the bunched stranded conductor 7 in the radial direction of the electric wire 3. Therefore, the terminal 5 is attached to the end 3A of the bunched stranded conductor 7 by crimping via the intervening tape 41. At the end 3A of the bunched stranded conductor 7, a conductive particle-containing compound may be applied so as to adhere to the surface of each of the aluminum wires that make up the conductor 21. For example, the conductive particle-containing compound may contain 5 to 20 wt% conductive particles (e.g., Ni-P). In this case, after the conductive particle-containing compound is applied, an interposing tape 41 is wound around the outer circumferential surface of the bunched stranded conductor 7.

[0024] The area in which the interposing tape 41 is wound in the longitudinal direction L may be the entire area of ​​the end 3A that faces the wire connection portion 31, or a part of the area. The area in which the interposing tape 41 is wound in the circumferential direction of the bunched stranded conductor 7 may be the entire area of ​​the outer circumferential surface of the bunched stranded conductor 7, or a part of the outer circumferential surface.

[0025] The intervening tape 41 is a tape made of a material containing copper. The intervening tape 41 has, for example, the configuration shown in FIG. 6. FIG. 6 is a cross-sectional view of the intervening tape 41 at a cross section perpendicular to the main surface thereof. The intervening tape 41 has a main layer 41A made of copper or a copper alloy, and plating layers 41B and 41C. The plating layer 41B is formed on one surface of the main layer 41A. The plating layer 41C is formed on the surface of the main layer 41A opposite to the surface on which the plating layer 41B is formed.

[0026] For example, as shown in FIG. 6, plating layers 41B and 41C are formed on both sides of intervening tape 41. Examples of plating layers 41B and 41C include tin plating layers. When plating layers 41B and 41C are tin plating layers, copper contained in main body layer 41A diffuses into plating layers 41B and 41C, so that at least a portion of plating layers 41B and 41C has a composition of an SnCu compound. One of the surfaces of intervening tape 41 is designated conductor-side surface 41D. Conductor-side surface 41D is the surface that faces end 3A when intervening tape 41 is wrapped around the outer circumferential surface of end 3A.

[0027] The thickness of intervening tape 41 is preferably 5 μm or more and 100 μm or less. The thickness of plating layers 41B and 41C is preferably 0.1 μm or more and 2 μm or less. When intervening tape 41 includes plating layers 41B and 41C, corrosion of terminal 5 and bunched stranded conductor 7 can be suppressed.

[0028] There is no particular limitation on the winding method of the intervening tape 41. Examples of winding methods of the intervening tape 41 include lap winding and vertical attachment. The winding direction of the lap winding may be the same as or opposite to the parent twisting direction of the bunched stranded conductor 7.

[0029] The main layer 41A is, for example, an electrolytic copper foil or a rolled copper foil. One main surface of the electrolytic copper foil is a shiny surface, and the opposite main surface is a rough surface. The rough surface has a greater surface roughness and greater irregularities than the shiny surface. The shiny surface is the surface that faced the electrolytic drum when the electrolytic copper foil was produced. The rough surface is the surface that faced the opposite side to the electrolytic drum when the electrolytic copper foil was produced. When the main layer 41A is an electrolytic copper foil, it is preferable that the surface on the side of the end portion 3A of the electrolytic copper foil is a rough surface.

[0030] The surface roughness Sa of the conductor-side surface 41D is preferably 0.49 μm or more. A method for increasing the surface roughness Sa of the conductor-side surface 41D includes, for example, processing with sandpaper. The coarser the sandpaper used for processing, the greater the surface roughness Sa. The method for measuring the surface roughness Sa is a method using a laser microscope. The measurement conditions for measuring the surface roughness Sa using a laser microscope were in accordance with Japanese Industrial Standard JIS B0681-3:2019. The surface roughness Sa of the conductor-side surface 41D is preferably equal to or less than the radius of the aluminum wire that constitutes the conductor 21.

[0031] 2. Manufacturing method of terminal-attached electric wire 1 The terminal-fitted electric wire 1 can be manufactured, for example, by the following method. (1) Prepare the electric wire 3. At this point, the bunched stranded conductor 7 is covered with the insulating layer 9 even at the end 3A.

[0032] (2) The insulating layer 9 is removed from the end 3A. The removed length of the insulating layer 9 is the same as the length of the electric wire connecting portion 31 or longer. (3) At the end 3A, the intervening tape 41 is wound around the outer peripheral surface of the end 3A. When the main layer 41A is an electrolytic copper foil, it is preferable to wind the intervening tape 41 so that the surface of the electrolytic copper foil on the end 3A side becomes a rough surface. It is also preferable to wind the intervening tape 41 so that the surface of the intervening tape 41 having a surface roughness Sa of 0.49 μm or more becomes the conductor-side surface 41D. (4) The end 3A and the interposing tape 41 are inserted into the inside of the electric wire connecting portion 31, and the electric wire connecting portion 31 is crimped.

[0033] 3. Benefits of Terminal-Attached Wire 1 (3A) When the conductors 21 constituting the bunched stranded conductor 7 are conductors 21 containing aluminum and the terminals 5 are tin-plated copper terminals, the conductors 21 are generally prone to oxidation in high-temperature environments, which increases the electrical resistance between the terminals 5 and the electric wires 3. The interposing tape 41 can suppress oxidation of the conductors 21 and reduce the increase in electrical resistance between the terminals 5 and the electric wires 3, even in high-temperature environments.

[0034] The reason for this can be assumed as follows. When the wire connection portion 31 is crimped, cracks occur on the conductor-side surface 41D. As a result, as shown in FIG. 7, irregularities occur on the conductor-side surface 41D. The conductor 21 bites into the recesses on the conductor-side surface 41D and adheres tightly. Therefore, even in a high-temperature environment, oxidation of the conductor 21 can be suppressed, and an increase in electrical resistance between the terminal 5 and the wire 3 can be reduced.

[0035] (3B) When the surface roughness Sa of the conductor-side surface 41D is 0.49 μm or more, oxidation of the conductor 21 can be further suppressed, even in a high-temperature environment, and an increase in electrical resistance between the terminal 5 and the electric wire 3 can be further reduced. The reason for this can be presumed as follows. When the surface roughness Sa of the conductor-side surface 41D is 0.49 μm or more, the unevenness of the conductor-side surface 41D becomes even greater. Therefore, the conductor 21 can more easily bite into the recesses in the conductor-side surface 41D. As a result, oxidation of the conductor 21 can be further suppressed, even in a high-temperature environment, and an increase in electrical resistance between the terminal 5 and the electric wire 3 can be further reduced.

[0036] (3C) When the main body layer 41A is made of electrolytic copper foil and the surface of the electrolytic copper foil on the side of the end 3A is rough, oxidation of the conductor 21 can be further suppressed, even in a high-temperature environment, and an increase in electrical resistance between the terminal 5 and the electric wire 3 can be further reduced. The reason for this can be presumed as follows: When the surface of the electrolytic copper foil on the side of the end 3A is rough, the unevenness on the conductor-side surface 41D becomes even greater. Therefore, the conductor 21 can more easily bite into the recesses on the conductor-side surface 41D. As a result, oxidation of the conductor 21 can be further suppressed, even in a high-temperature environment, and an increase in electrical resistance between the terminal 5 and the electric wire 3 can be further reduced.

[0037] <Example> 1. Production of Terminal-Attached Electric Wires 1 of Examples 1 to 6 The electric wires with terminal 1 of Examples 1 to 6 were manufactured in the same manner as in the first embodiment. The electric wires with terminal 1 of Examples 1 to 6 had the following common features. (Common feature) The diameter of the bunched stranded conductor 7 was 15 mm. The bunched stranded conductor 7 was made by twisting together 19 conductors 21. The diameter of each conductor 21 was 3 mm. Each conductor 21 was made by twisting 34 aluminum wires with a diameter of 0.45 mm. The composition of the aluminum wire constituting the conductor 21 was Al-Fe-Zr. Note that no plating layer was formed on this aluminum wire.

[0038] At the end 3A, the interposing tape 41 was wound around the entire outer periphery of the bunched stranded conductor 7. The range in which the interposing tape 41 was wound in the longitudinal direction L was the entire portion of the end 3A facing the wire connection portion 31.

[0039] As shown in FIG. 6, the interposing tape 41 had a main body layer 41A made of copper and plating layers 41B and 41C. The plating layers 41B and 41C were tin plating layers. The plating layer 41B was formed on one surface of the main body layer 41A. The plating layer 41C was formed on the surface of the main body layer 41A opposite to the surface on which the tin plating layer 41B was formed. The main body layer 41A made of copper had a thickness of 37 μm. The plating layers 41B and 41C each had a thickness of 1 μm.

[0040] The terminal 5 was a round crimp terminal R100-20 having a wire connection portion 31 and a mating connection portion 33. The terminal 5 was a tin-plated copper terminal. The terminal 5 had a main body 5A made of copper and a tin-plated layer 5B. The tin-plated layer 5B was formed on the surface of the main body 5A and on the inner surface of the wire connection portion 31. The tin-plated layer 5B was composed of a lower layer made of a SnCu alloy and an upper layer made of Sn. The thickness of each tin-plated layer 5B was 8 μm.

[0041] The crimping tool used to crimp the electric wire connection portion 31 was S7G-M250P (Izumi Seiki Seisakusho). The die used to crimp the electric wire connection portion 31 was a crimping die for R100.

[0042] The terminal-attached electric wires 1 of Examples 1 to 6 differed from one another in the following differences regarding the interposing tape 41. (Differences) In Example 1, the main layer 41A of the intervening tape 41 was an electrolytic copper foil. In Example 1, the surface of the electrolytic copper foil on the side of the end 3A was a shiny surface. The surface roughness Sa (arithmetic mean height) and Sz (maximum height) of the conductor-side surface 41D in Example 1 are shown in Table 1.

[0043] [Table 1]

[0044] In Examples 2 to 5, the main layer 41A of the interposer tape 41 was rolled copper foil. In Examples 2 to 5, the conductor-side surface 41D was sanded. The grit sizes of the sandpaper used in Examples 2 to 5 were #2000, #1000, #500, and #220, respectively. The surface roughnesses Sa and Sz of the conductor-side surface 41D in Examples 2 to 5 are shown in Table 1.

[0045] In Example 6, the main layer 41A of the interposer tape 41 was an electrolytic copper foil. In Example 6, the surface of the electrolytic copper foil on the edge 3A side was a rough surface. The surface roughnesses Sa and Sz of the conductor-side surface 41D in Example 6 are shown in Table 1.

[0046] 2. Manufacture of terminal-attached electric wire for comparison An electric wire with terminal of a comparative example was manufactured, which basically had the same configuration as the electric wire with terminal 1 of Examples 1 to 6. However, the electric wire with terminal of the comparative example did not include the interposing tape 41.

[0047] 3. Measurement of the resistance increase rate Z The resistance increase rate Z was measured for each of the electric wires with terminals 1 of Examples 1 to 6 and the electric wires with terminals of the comparative examples by the following procedure. First, Rt and Rc were measured. Rt is the electrical resistance between point P1 on the electric wire 3 shown in FIG. 1 and point P2 on the mating connection portion 33. Point P1 is a point on the electric wire 3, and is a point on the bunched stranded conductor 7. The electrical connection path between point P1 and point P2 includes the connection portion between the electric wire 3 and the terminal 5. Rc is the electrical resistance between point P1 and point P3 on the electric wire 3. The distance between point P1 and point P2 is equal to the distance between point P1 and point P3.

[0048] Next, Rt and Rc were substituted into the following formula (1) to calculate the resistance ratio Y (%). Equation (1) Y = (Rt / Rc) × 100 Next, the electric wires with terminal 1 of Examples 1 to 6 and the electric wires with terminal of the Comparative Example were placed in an environment where heat cycles were repeated. Each heat cycle consisted of heating to 125°C, maintaining at 125°C for 1 hour, cooling to -40°C, and maintaining at -40°C for 1 hour.

[0049] After repeating the heat cycle 50 times, the resistance ratio Y was calculated again. The resistance ratio Y calculated before repeating the heat cycle was defined as the initial resistance ratio Y1 (%). The resistance ratio Y calculated after repeating the heat cycle 50 times was defined as the resistance ratio Y2 (%) after 50 cycles. The resistance increase rate Z (%) was calculated using the following formula (2). Equation (2) Z=Y2-Y1

[0050] The resistance increase rates Z for the electric wires with terminal 1 of Examples 1 to 6 and the electric wires with terminal of the comparative examples are shown in Table 2 and Fig. 8. In each example and comparative example, two identical electric wires with terminal were manufactured, and the resistance increase rates Z for each were measured. The two electric wires with terminal were designated Samples 1 and 2. Fig. 8 shows the average values ​​of the measured values ​​for Samples 1 and 2.

[0051] [Table 2]

[0052] The resistance increase rate Z in the terminal-attached electric wires 1 of Examples 1 to 6 was smaller than the resistance increase rate Z in the terminal-attached electric wire of the comparative example. In the terminal-attached electric wires 1 of Examples 3 to 6, the surface roughness Sa of the conductor-side surface 41D was 0.49 μm or more. In the terminal-attached electric wires 1 of Examples 1 and 2, the surface roughness Sa of the conductor-side surface 41D was less than 0.49 μm. The terminal-attached electric wires 1 of Examples 3 to 6 had even smaller resistance increase rates Z than the terminal-attached electric wires 1 of Examples 1 and 2.

[0053] In the terminal-attached wire 1 of Example 6, the main body layer 41A was made of electrolytic copper foil, and the surface of the electrolytic copper foil on the side of the end portion 3A was rough. The terminal-attached wire 1 of Example 6 had an even smaller resistance increase rate Z than the terminal-attached wires 1 of Examples 1 to 5.

[0054] 4. Cross-section observation The electric wires with terminal 1 of Examples 1 to 6 were each subjected to cross-sectional observation as follows. The electric wires with terminal 1 of Examples 1 to 6 were cut at a cross section perpendicular to the longitudinal direction L and passing through the end portion 3A and the electric wire connection portion 31. Of the cross sections resulting from the cutting, an observation portion 101 shown in FIG. 5 was observed using an electron microscope. The observation portion 101 was a portion where a compressive force was applied when the electric wire connection portion 31 was crimped. The observation portion 101 also included a portion where the electric wire connection portion 31 and the bunched stranded conductors 7 faced each other with the intervening tape 41 interposed therebetween. The observation portion 101 was a portion where gaps were likely to occur between the terminal 5 and the bunched stranded conductors 7 due to springback after compression.

[0055] 9A to 9F show electron microscope photographs obtained by imaging the observation area 101. Fig. 9A corresponds to Example 1, Fig. 9B corresponds to Example 2, Fig. 9C corresponds to Example 3, Fig. 9D corresponds to Example 4, Fig. 9E corresponds to Example 5, and Fig. 9F corresponds to Example 6.

[0056] In the case of the electric wires with terminal 1 of Examples 1 to 5, gaps occurred at the interface between the interposing tape 41 and the conductor 21. In particular, in the case of the electric wire with terminal 1 of Example 1, the gap at the interface was even larger. In the case of the electric wire with terminal 1 of Example 6, the conductor 21 was embedded in the irregularities of the conductor-side surface 41D. Furthermore, in the case of the electric wire with terminal 1 of Example 6, no gaps occurred at the interface between the interposing tape 41 and the conductor 21. <Other embodiments> Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0057] (1) In the bunched stranded conductor 7, the number of layers in which the multiple conductors 21 are arranged in the circumferential direction may be other than three, and may be, for example, two, four, five, six, etc. (2) In a cross section perpendicular to the longitudinal direction L, the conductors 21 do not have to be arranged in the circumferential direction. For example, in a cross section perpendicular to the longitudinal direction L, the conductors 21 may be arranged randomly. (3) The electric wire 3 may include a concentrically twisted conductor or a concentrically twisted conductor instead of the bunched stranded conductor 7. A concentrically twisted conductor has one strand at the center and other strands twisted concentrically around that single strand. A concentrically twisted conductor is formed by further twisting together multiple bunched stranded conductors 7. A concentrically twisted conductor and a concentrically twisted conductor each consist of a bundle of multiple conductors 21. (4) At the end 3A, the bundle of conductors included in the electric wire 3 may be untwisted. For example, at the end 3A, the bunched stranded conductors 7, concentric stranded conductors, or composite stranded conductors included in the electric wire 3 may be untwisted.

[0058] (5) The function of one component in each of the above embodiments may be shared among multiple components, or the functions of multiple components may be performed by one component. Also, part of the configuration of each of the above embodiments may be omitted. Furthermore, at least part of the configuration of each of the above embodiments may be added to or substituted for the configuration of another of the above embodiments.

[0059] (6) In addition to the above-described electric wire with terminal 1, the present disclosure can also be realized in various forms, such as a system including the electric wire with terminal 1 as a component, a method for manufacturing the electric wire with terminal 1, and the like. [Explanation of symbols]

[0060] 1...terminal-attached electric wire, 3...electric wire, 3A...end portion, 5...terminal, 5A...main body portion, 5B...tin plating layer, 7...bundled stranded conductor, 9...insulating layer, 21, 21A, 21B, 21C, 21D...conductor, 31...electric wire connection portion, 33...mating connection portion, 41...intervening tape, 41A...main body layer, 41B, 41C...plating layer, 41D...conductor side surface, 101...observation portion

Claims

1. an electric wire in which a bundle of conductors is covered with an insulating layer; an intervening tape wound around an outer peripheral surface of a conductor exposed portion where the bundle of the plurality of conductors is exposed from the insulating layer; a terminal attached by crimping to the exposed conductor portion via the interposing tape; Equipped with each of the plurality of conductors includes aluminum; The terminal includes a main body made of copper or a copper alloy and a tin-plated layer formed on a surface of the main body, The interposing tape comprises a main layer made of copper or a copper alloy and a tin-plated layer formed on the surface of the main layer. Wire with terminals.

2. The terminal-attached electric wire according to claim 1, The surface roughness Sa of the surface of the intervening tape on the side of the conductor exposed portion is 0.49 μm or more. Wire with terminals.

3. The terminal-attached electric wire according to claim 1 or 2, the main body layer is made of electrolytic copper foil, The surface of the electrodeposited copper foil on the side of the conductor exposed portion is a rough surface. Wire with terminals.

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